CODEWITHSUNDEEP
cstringfor-loopfile-iochar
Andromeda
Andromeda

Reputation: 17

Passing char array to file using for-loop

I am just learning how to work with file IO and I am probably super wrong. I need to create and write to a file a list of city names and its population density.I am able to print the list properly formatted in standard output using a for-loop, but am unable to write it to the file. Like I said when using a printf statement, it works just fine, but the (fopen, "w") fprintf isnt working. Where am I going wrong?

   printf("Create new file name:\n");
   scanf("%s", outfile);

   fp = fopen(outfile, "w");
   for(i=0;i<10;i++){
        fprintf("%s  %.2f\n", veg[i].name, density );
    }



    fclose(fp);

I expect the file to be populated with the list of cities, but I the program is crashing instead. I receive this error message.

"Incompatible pointer types passing 'char [10]' to parameter of type 'FILE *' (aka 'struct __sFILE *')"

Upvotes: 0

Views: 108

Answers (1)

Sofian Moumen
Sofian Moumen

Reputation: 43

You need to specify the file to write in in your fprintf() call. fprintf(outfile,"%s %.2f\n", veg[i].name, density );

Here's the doc : https://en.cppreference.com/w/c/io/fprintf

You also need to return whether or not your fopen failed. 

if (fp != NULL)
{
    printf("File created successfully!\n");
}
else {
    printf("Unable to create file.\n");
    exit(EXIT_FAILURE);

}

Be aware that if you use Visual studio, you'd have to use fprintf_s() instead where you'd have to specify the sizeof your string.

Upvotes: 1

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